Based on the clue 'a common name for trefoil', what is the answer?

Based on the clue 'a common metaphor this part of the iceberg thats a...', what is the answer? Based on the clue 'a common method of torture involves running finger...', what is the answer? Based on the clue 'a common mineral or what there are 4 of in a gallo...', what is the answer? Based on the clue 'a common mineral used to make plaster of paris', what is the answer? Based on the clue 'a common one is water in the road caused by light ...', what is the answer? Based on the clue 'a common one of these is break a mirror youll hav...', what is the answer? Based on the clue 'a common phrase in lewis carrolls day was grin lik...', what is the answer? Based on the clue 'a common place name in the southwest from a spanis...', what is the answer?